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InteractiveUserAuthenticator.cs
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InteractiveUserAuthenticator.cs
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// ----------------------------------------------------------------------------------
//
// Copyright Microsoft Corporation
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ----------------------------------------------------------------------------------
using Azure.Core;
using Azure.Identity;
using Hyak.Common;
using Microsoft.Azure.Commands.Common.Authentication;
using Microsoft.Azure.Commands.Common.Authentication.Abstractions;
using System;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Threading.Tasks;
namespace Microsoft.Azure.PowerShell.Authenticators
{
/// <summary>
/// Authenticator for user interactive authentication using browser.
/// </summary>
public class InteractiveUserAuthenticator : DelegatingAuthenticator
{
// possible ports for adfs: [8405, 8408)
// worked with stack team to pre-configure this in their deployment
protected const int AdfsPortStart = 8405;
protected const int AdfsPortEnd = 8408;
// possible ports for aad: [8400, 9000)
protected const int AadPortStart = 8400;
protected const int AadPortEnd = 9000;
public override Task<IAccessToken> Authenticate(AuthenticationParameters parameters, CancellationToken cancellationToken)
{
var interactiveParameters = parameters as InteractiveParameters;
var onPremise = interactiveParameters.Environment.OnPremise;
//null instead of "organizations" should be passed to Azure.Identity to support MSA account
var tenantId = onPremise ? AdfsTenant :
(string.Equals(parameters.TenantId, OrganizationsTenant, StringComparison.OrdinalIgnoreCase) ? null : parameters.TenantId);
var tokenCacheProvider = interactiveParameters.TokenCacheProvider;
var resource = interactiveParameters.Environment.GetEndpoint(interactiveParameters.ResourceId) ?? interactiveParameters.ResourceId;
var scopes = AuthenticationHelpers.GetScope(onPremise, resource);
var clientId = Constants.PowerShellClientId;
var requestContext = new TokenRequestContext(scopes, isCaeEnabled: true);
var authority = interactiveParameters.Environment.ActiveDirectoryAuthority;
var options = new InteractiveBrowserCredentialOptions()
{
ClientId = clientId,
TenantId = tenantId,
TokenCachePersistenceOptions = tokenCacheProvider.GetTokenCachePersistenceOptions(),
AuthorityHost = new Uri(authority),
RedirectUri = GetReplyUrl(onPremise, interactiveParameters.PromptAction),
LoginHint = interactiveParameters.UserId,
};
options.DisableInstanceDiscovery = interactiveParameters.DisableInstanceDiscovery ?? options.DisableInstanceDiscovery;
var browserCredential = new InteractiveBrowserCredential(options);
TracingAdapter.Information($"{DateTime.Now:T} - [InteractiveUserAuthenticator] Calling InteractiveBrowserCredential.AuthenticateAsync with TenantId:'{options.TenantId}', Scopes:'{string.Join(",", scopes)}', AuthorityHost:'{options.AuthorityHost}', RedirectUri:'{options.RedirectUri}'");
var authTask = browserCredential.AuthenticateAsync(requestContext, cancellationToken);
return MsalAccessToken.GetAccessTokenAsync(
authTask,
browserCredential,
requestContext,
cancellationToken);
}
protected Uri GetReplyUrl(bool onPremise, Action<string> promptAction)
{
var port = GetReplyUrlPort(onPremise, promptAction);
return new Uri($"http://localhost:{port}");
}
private int GetReplyUrlPort(bool onPremise, Action<string> promptAction)
{
int portStart = onPremise ? AdfsPortStart : AadPortStart;
int portEnd = onPremise ? AdfsPortEnd : AadPortEnd;
int port = portStart;
TcpListener listener = null;
do
{
try
{
listener = new TcpListener(IPAddress.Loopback, port);
listener.Start();
listener.Stop();
return port;
}
catch (Exception ex)
{
promptAction(string.Format("Port {0} is taken with exception '{1}'; trying to connect to the next port.", port, ex.Message));
listener?.Stop();
}
}
while (++port < portEnd);
throw new Exception("Cannot find an open port.");
}
public override bool CanAuthenticate(AuthenticationParameters parameters)
{
return (parameters as InteractiveParameters) != null;
}
}
}